I bleached my hair HELP!!!?

last night I dyed my hair blond, i did a test strand and it turned out fine but after I did my whole hair it went from dark brown to highlighter yellow! I knew it was gonna happened but my BF insisted so i just went with it. Today I wanted to fix it with a brown dye but again I foolishly listned to my BF and tried another blond, now its even more yellow. How can i fix this, I have no money for the hair dresser. can i just get a dark brown or black dye to fix it?